VICI Two position Standard electric - Manual (Page 5)

3.
CONTROLLING THE ACTUATOR
WITH A COMPUTER
The remote switching cable is used to communicate a momentary or continuous
contact closure or a negative true logic level signal from a data system, required
for automated operation of the actuator. In addition, two of the cable’s leads
supply feedback from the actuator. Since the input signal must be of 10 to 20
milliseconds duration to switch the actuator, a sub-millisecond noise spike will not
start the actuator.
3.1 Using a Relay Output
If the data system has two relays available, then one relay can be dedicated to
each position of the actuator. This is ideal, since it allows the manual switch to
function normally. Connect the black wire (INJECT) to the normally open (NO)
terminal of the first relay and the the green wire (GROUND) to its common or logic
ground terminal. Connect the red wire (LOAD) to the normally open (NO) terminal
of the second relay, and connect a jumper wire from the common or logic ground
of the first relay to that of the second. (Figure 2)
Program the data system to energize the first relay when the valve is to be
switched to the INJECT position, leaving it energized for only two or three seconds.
Likewise, at the time for LOAD, turn on the second relay for a few seconds. The
INJECT relay must be turned off before the LOAD relay is turned on, and vice
versa. If the valve will not move out of a position, it is most likely that the relay
which switched it to that position has not been turned off. When neither relay is
energized, the manual toggle switch can be used as described on the previous
page.
If the data system has only a single double-pole relay with normally open (NO)
and normally closed (NC) terminals (Figure 3), connect the green wire (GROUND)
to the relay common or logic ground. Connect the black (INJECT) wire to the
normally open (NO) relay terminal and the red (LOAD) wire to the normally closed
(NC) terminal. The computer must be programmed to keep the Normally Open
(NO) relay contact engaged (ON) as long as the actuator is to be in the INJECT
position.
RELAY 1
RELAY 2
GREEN
BLACK
RED
NO
GND
GRD
NO
Figure 2: Dual relay connection
GREEN
BLACK
RED
GND
NO
NC
Figure 3: Single relay connection
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